SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa787442594ce296e9f9ae15f236a5554c73320e8b3a2d6dc2a71db321ec02cc' 
  AND token = 'PCo1YKZ1PKtcIAh+6LX97ZynyB+qWl/Swk9J2xYRpFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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