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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa815011e5f698c26b0ff388df9960c2bfc977206c7bfad0e655bbbfa079b297' 
  AND token = 'yX/riNpHIfiCc6f0migNGOiJGcB5RF3dij0wNndEwt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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