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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da41efe402d5be4ca649d8e5800339c243390f55b11e5227ad7fbe562eb530c1' 
  AND token = '4fH+NTyXsUZ1v37XzbalJj21fD/yvG81mPDh5SXYTts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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