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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f865030af9682adf609fab080aa08e39956f03ced544a17130e71acbeab6d6' 
  AND token = 'FJzBef523XSELnViAlXTVA0lOS+rliNJbEdYXRvB5lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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