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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe1d804c07c21db66b3a174ebdb73bee51a8d2d31d409cd8454c83136d5472a' 
  AND token = 'XZwuL/Wh6IVuBD6j/DI0uussqCPOstSsTv+r7VZqsOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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