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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765dd8dbf00d7ce15193242b31fd0321e6084a9e1277f8dab637ebf9c5e94191' 
  AND token = 'lOlOerpbn4dtyw8kK0LVLp+G0BHY92d1KoTYg+xQj48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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