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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ad83ad52d1aa9b4854190ae99ae58b57ad35c6afc790dd6ee6559c62a7796d' 
  AND token = 'XAhW6ln+a5P9Mn7ogIxSPNTYm1kLJ1wVntIwmaxHB1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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