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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7cde6d30293296719bd8ba12f2324d5d6aeb2051619d6dbabae7ad7dace797' 
  AND token = '2I/+UHebkI09WnoQcq9JkbOWoGhdmkPO8mbX/tfN/t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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