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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e447ed43abeb923559e4b7ca25fbc1659d0f39869a8c923bb7f2526c03cf02ec' 
  AND token = 'eMT/y4CXgXF494beXyP0W0YNhDVr8z5LJTBotBIVkc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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