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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cce375ab70002c7862aa7f4f6d673a329e6be50e741b2c385dcb5debacf2ed' 
  AND token = 'liAOqHY2Ve9PrSA+k56ljLyflNBlhS4IalcF9sFQ9x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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