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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fabd4704f74ae9c66acf95ae8737326cebfd7eada67482dd949bf6a888afbc3' 
  AND token = 'RT+Eyv2lk/jvdg9NHor07C/QRKLt/mTxN0SaiR5/BT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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