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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82759ad7f15433209f8b342b5d67c720aa6ec3e953fbbe5516d7a8c950e53ae' 
  AND token = '0mHVwnirio69EzE0ynyq5e9YiQ2hLzuM05LkS9Mdw1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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