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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ab21067acd481a81d2024e47b88e154df8ff0ca0cb7d6f24f4ee9d9d37b3cb' 
  AND token = 'u66YTVMHvdB9WRE9THBY15iaFklOGIbKwC2UnFCF498=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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