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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8085e16702c0f18808d3774decb20bd4fbdbb07ebf2b4b51946aceb2b84a6783' 
  AND token = 'Zgk9KYBAR0iexWfIvzTr5NAdl5Z8HE6qmDKBrb/t3AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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