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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc352afe9873b30cf74a933732dc3a3cea586ae54fe7ac13f7e1c86c24ed2fe' 
  AND token = '0PiBxIMjR/oZhIf7GIiyfg5yu2fX8zwB9S7bXmO14/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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