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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b0c8d05f9eae2e25dd2f540a0ce736c7cf1526af1958500a3a5ae5a1421529' 
  AND token = 'NGmULaW+5a/8XL7b+iEt/lrT02VTXHlz0O1P/jZKCk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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