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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fceebeadf440390c2c67bfcdbf14a8afc00d274967f87327e2533087d75a8652' 
  AND token = '+6GZ9fiffem74YZ+7bwKbj8BgYZXQYmyZTfZQW//YxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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