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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03f58a1adaa082ceb8fdcc59bcd55c480e4ccbd1f3e8d4e21e1150c8aa81196' 
  AND token = 'k/U1hxxcMvFy1Ihq0CfuefKzjAdDMQp7fZU3RLizZZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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