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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3356884a27d7eef394f8358166ecf81419ea4e6cb6d131313f423f92681da71d' 
  AND token = 'a1PAxIyR6kbJ0GUviho0eK/ldN8cVNz0IKbTZQ7W4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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