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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a675233981af3429628037cef2441e0cb6f6d6ef51646698e760036f8c428ded' 
  AND token = '+nRsI8vi9O58CNosJd6ykGPshQA5tYU9eiaW6p4vVuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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