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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f447aa386e017c20b30353a87be3b0e74f21a6f661c719a641d5b5de3b638e' 
  AND token = 'oDMjcybFftG7/w67LUXiPYiPK/6rwejqcUxrq/sh4Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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