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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f04d570073d20c8bfa7eb7c0b7a06a313eb3e73b0b66994c46aafa3f8a21103' 
  AND token = 'WM7RrZImFtGMBOXZi+X6jNbmBxRsU2SDWWYiU14AYyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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