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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c15286a551dcd7a358643454a022fb20d2ea9f0f983920d1fd0035cea81bb7' 
  AND token = 'I/j7TuZDIvYqG468ScawX0pTWqG4ATRGXt/ua8D6K8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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