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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275c44565fd207c49848a6b6948e7560b846329a6fc4e4a8cfeaf204c812f3d4' 
  AND token = 'k/a9IheDxNsucqXeghT2eTlZb0eXQ13FEANecg37PO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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