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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0797f3b8c847c86a66d2c63ce556b729e4ef30bcea82e3825f572b3e8a1e775' 
  AND token = 'Ai1bsFFyVpwzfeiqd5Kg7YVcIY/tWv2/zqe8RRSRIIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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