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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a5d507802160e3e8e17404ba831fbb1ffb0e04e7e001c2fbca028a0cdf6c76' 
  AND token = 'zK6n2PP7Ibzzc9B28REk8xfKpjgpgb5J7MGzrqoPuoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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