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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4073e20d1c1b81b43cd0fbcca210a7661920ce520518d3ca76e722250f8651' 
  AND token = 'IIfE9ESuqnYv6n2r2BFXImI7orQaUDuZahU5Uy30N+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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