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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e134e60d724c30974fbf0ebd8331c63360f62b91f35ebef197eeab271c92aa8a' 
  AND token = 'NRplZ7bx1USSuH2HSvMto1FCSGxqz6bk3ru6yb51P8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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