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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad9d0f59844b70f0b49af336754dba4dd5eb14aa47091228ca1caa9bdc4e6f9' 
  AND token = 'cQDFi1fHFsbSodZEfecscy/ePaNoZmwbcYsx6uQuwNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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