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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1e7692d2737239645c72404af5bd25bdd4e969e8b2b5c51ab51f15cddd66b2' 
  AND token = '+rUgAzRnCH13Cm04cye2LiSRPDGuofttqxoA/Gzd/TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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