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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0892896c476e3cd6163851e43910641874ca15d91e80ac90b4e883c66f7b1e' 
  AND token = 'DJxx+aQMn4SxlJtRMIHsIAVoHZiZkOnoymNwUe3prGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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