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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69c5d2910c64097d3bce0b0f0f073f4f0012acb84440a4d4ffa9998d8743a3b' 
  AND token = 'bBCRg3XtPS3xIViMXqrSSwIaNsovLvqtz4T13+UVeKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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