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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd685c93daffa04b3abd44606952e72d9006366fb625b4e43a93c6ac5befe6a' 
  AND token = 'CpUB0WeBd0m/Yytl+V4jRn8v2s5Cq4PW4vsFNk2gWHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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