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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fa341b799808eaebec7c51511ce5f1c2cc3abeeda9ca6a1b655f4750a5a238' 
  AND token = 'OwkUSeRjPSwRWN9zxzwy4db2sFZc02lJyME5tLHtoSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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