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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4826662a38e982c5ad6aa49ed4602256b2c04dfc69706afd005766545c8abe5' 
  AND token = 'XCFrHCaJL89EJln2CqUS2Vkn/Q0Khk82x39kl/R3SA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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