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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d40d2a2b14e7e3e9773adcf3da502c8b1b67685036269880aee050c2cbac77' 
  AND token = 'ydv6pWOOjIkutWUy5GoFC0FaEO3aYaAxCYrdsYT0bBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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