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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7985bf0dbca3cb3b950d4ec5fb0d4dc5384f690386c8a9d749cb388af2521e4' 
  AND token = 'r+mQzn8o14Ay4DlSe6U7BqtuOyUL85c44qCub1ICHTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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