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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84af3a5c0eb366b817934ee2316c1c115200ffafca4535fbf3b4c4062e4d23db' 
  AND token = 'S0JlxGBuTjXuxJXECeJO20pXGYpSr7SiIZ5o80UoPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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