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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611265aafce3ec5a86b5dbd66d35c9a7b4666ee98f936ca29f846afa3a6adfbd' 
  AND token = 'nqhDTDMrA6ieuKdUxtJCFne0iqZuzOqsVF38ODohab0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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