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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4082880cbb1c06d40eb5b10883030f46c4ad541e17d244007702a9897d087e97' 
  AND token = 'FxAV46A4GwkpObWq5+LzMFy5OhAbil+Z4MPLG3DfziE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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