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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708ae0de495f7a974d87dee6a5616cfd312f4cc513fb457faf65c9f1576ee86e' 
  AND token = 'bVDCz9PMEA5Ab3TjvgoRzv+sEefLSoIUpJmWMDnd78g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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