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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bda8f7d91fe552e98b7546e7ab0f52205349e50340d78ad982309f83be83d7' 
  AND token = 'BQ7PQieGmNgHXkv6Wb5QkbkW0ozherFS6B1kB6B1ZFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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