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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6d8455b4bbb0c61143dbbe9509cfb58fe6033ab276f9afdf9d9bdc0afc4677' 
  AND token = '0nBgSVLi2CK5YYCzlTH7TCLILLhdwvbkoAb3WnnBWN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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