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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01db36b31a6dcc8d4f237ae359a8bf813194ab3fca13c6b64808cb11ab2d400c' 
  AND token = '3iD53/A3ioYoiodcVzykTdYbkpjbgsOnI0DMRYXW/qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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