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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59f1a3368b0acaa89ea3afa2614b387bef3c67e6d53d9838f5581005430001e' 
  AND token = 'khB/JVyJTzJV9QjYwg8eLWusq4aCoE5/xttjNVolHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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