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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcaba1eab5c1402b517babaa65dc1c1f57bebb0d5f0408044083756daac66965' 
  AND token = 'rLiHrLEXtdDWBKmN5K7DWvtwgKQlmfvDuMvslfiJ9l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}