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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a477f39a4e3fc722f29748e2936e99ca17bd17f0c253646c95efe46719728af' 
  AND token = '0TOxcbn3QPmnSNXoBMr/7vwhzE4MdQ0ve69zWeqgjYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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