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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bf36421ebaf968336096a891751ef85489b94445cda5d448e5749e8d6ff221' 
  AND token = '0u3/twYI9dhvh7NXoa+J7Z3NN3OASun3zNKtswg/844=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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