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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dbba22d5f31488ad5d3fd9c479b055257d852a6852e216147897c5d09ed2cd' 
  AND token = 'e38tskeDec+ia7SNdjbGzceqAXmhfPCUqZam27znk9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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