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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882995b8bc6ff1c008a3fac1bfaa207786bf9bff9de574bdd8a76256f95c4fb3' 
  AND token = '1rpzvE++ltXSNz+Nw4DPHtywxlKqWNnE8eHmkDQAtyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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