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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b945954eec3f6ae331bd3ac509c1ab8b4d468f4b996f419bad35eb15a7f52d' 
  AND token = 'DhmIkj8C545yBwNtPzEOIJPC8Y0C29BSuMOJ2KmHhoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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