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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18efe2cb88a9377fe5c9b7210780d3b0071e0d8cd56ea2ffd308915661002946' 
  AND token = 'WJA73KdbeuBaNyY1JwmOyYM6TwP1LxZer3zacWBm3cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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