SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54ef463afb9e33437e8c9e3f87a7061b825ff693e9ac7e96240487b35bdf8b1' 
  AND token = 'zWc3BOTwt+NxKP8HKMl/9/qFdHBW0YIHLQVUIsz6+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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