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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f86ec96a1d0ff8de09b15bd3ea61e4515ebccba06a6a2b275a43246b8bab68e' 
  AND token = 'uNKHO7K05gDaCRQ7vTgk9OabE3KhREORvSEgdkd7Uiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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