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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e73cf568d345ad13f642776100d924cd57a3f1740bcd54bec4edf384cb82e7' 
  AND token = 'SugsGi0aSS1mGo+97mdwBXUHGV1o3uV+dJWrZkVsf94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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