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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7240cc1fc43d7abd4331cda79bb4b2038e49d85c98afff8b93943f164bf2db83' 
  AND token = 'JhbANOiY7V8SndsMwuQQXvMaTHLla24BY3zF4soYeVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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