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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f030c4a9e3db0a8a885e6052a2462b628d86886ddd8011d501f77ec7e986e43' 
  AND token = '/UVVZi7C06WZWnm8mCqDPeRSfvC4CuLwJ8JEi2QShxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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