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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10778809f59e9da6419603d2437d3ccf1b08b04f0bb11f652973e488cec8e70' 
  AND token = 'wVNapMfOwEdTFVgmuPVFXQczK4V4/90i5oH/UXbmIAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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