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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8e84a8b8b6e3fac0712c528a73e10f1cff8d469b2b991ed4de7ab64bfbc32f' 
  AND token = 'gc1aSNv00IZN7zCzsJj2PU7UbLMNiBc0Y9dIohXRzHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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