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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc0c9f9e94cdff69057dae13bf3d75bafa34e8d7b662cc3f54bf9f2bf55934b' 
  AND token = 'is+E++EbVMgpYmujMpg2ERRdi39LKxRT366ORIhIn3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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