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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777c7434e8808c20b7f80feea3e823a07f181d4a643d8ac3928f290ef4665f6c' 
  AND token = 'wKBZA22Lh9D1tbKMUkKSM4Viuxs90XJ5otVXowI3bgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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