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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c8208bbe943b2f525e6fd5032cb8b9883be9770a61a97fe8a7c84558214ed5' 
  AND token = '514VATuJly7IUo8f8Qu2rJ/TagV0770O5KNcPW0t1uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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