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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd95a14cbde5d6dbd6c9947535c67622d0a43c432d0b9909681c4fd42b17668f' 
  AND token = 'ggkyyiGQGNGHCRZCuxn4vWL3V94aVuVnTXLBBOizgio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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