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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d8b20d34bb501c825fb2b9ff838d194a5b7ba4f905fed8f84e5d85fa67ab70' 
  AND token = 'nISJjotqpJ7yKW7nbZ93D7mO5WHV0BxZy0B19sawP4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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