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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d21fad8e15da0301ca2f72568bfb1dd0e920f93bbf54877fb97bd516c946993' 
  AND token = 'qkEog/TRY+Ix0buaarx2ndqy3WFP3+KB4EFtuSCJJpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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