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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3021baaf307d4a688e774ee1776ae00d9d5e4472db889884f24f244bf67602f3' 
  AND token = 'cD4gOSJOu+wXANAIp7pLm3KACNggB6esjvv/CdCXpio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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