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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc3bee0b0d7ab6dbe24a81fa5102317a501e8385e0a5e4f2efe93a8bf590447' 
  AND token = 'lz9ib30y/ZTc8gXqrFkq8Ofya8q9UrOvlfziREkE7iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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