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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd755bd234bf327d6efb98b7182de274bcdca1d05ed2fdcbf6cade7cad0572cd' 
  AND token = 'pIi1noyfSoCFMP4b0L9pPyVfIFLPp5F3BBnDl9kzBew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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