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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff1ba038d1d27ba73d62088d14f4b120e603c47416edec7eef5b7555ce835ab' 
  AND token = 'QGqu7GyDj9VYHjQPENqPUfa17ADTpZnVhLg6YHjP1XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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